21113012323 has 24 divisors (see below), whose sum is σ = 23208021936. Its totient is φ = 19196236800.

The previous prime is 21113012267. The next prime is 21113012387. The reversal of 21113012323 is 32321031112.

It is not a de Polignac number, because 21113012323 - 2⁹ = 21113011811 is a prime.

It is a super-2 number, since 2×21113012323² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21113012323.

It is not an unprimeable number, because it can be changed into a prime (21113018323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3029563 + ... + 3036523.

It is an arithmetic number, because the mean of its divisors is an integer number (967000914).

Almost surely, 2^21113012323 is an apocalyptic number.

21113012323 is a deficient number, since it is larger than the sum of its proper divisors (2095009613).

21113012323 is a wasteful number, since it uses less digits than its factorization.

21113012323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7255 (or 7242 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21113012323 its reverse (32321031112), we get a palindrome (53434043435).

The spelling of 21113012323 in words is "twenty-one billion, one hundred thirteen million, twelve thousand, three hundred twenty-three".